(Sizes 4 and 5)This football features a thickened PVC outer cover, a material chosen with numerous considerations. PVC, or polyvinyl chloride, offers excellent abrasion and weather resistance. In everyday football play, whether on artificial or natural turf, the ball inevitably rubs against the surface. The thickened PVC material effectively resists this friction, reducing surface wear and extending the lifespan of the ball.Compared to other materials, such as regular rubber footballs, PVC footballs offer superior durability. Football enthusiasts have conducted tests showing that, under the same usage conditions and frequency, regular rubber footballs show noticeable wear and peeling after a period of use, while this thickened PVC football maintains its excellent appearance and performance. Please pay attention to the size and don't choose the wrong one